An assembly for dispensing a beverage includes a collapsible beverage container having a neck part with an outlet. A connecting element is arranged at the neck part so as to receive an inlet end of a dispensing line. The beverage container is contained in a pressure chamber having an interior configured to accommodate the beverage container and a lid. The connecting element is configured for abutment with the lid of the pressure chamber to form a seal between the lid and the beverage container during use.